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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13744–13754

Generation and subwavelength focusing of longitudinal magnetic fields in a metallized fiber tip

Daniel Ploss, Arian Kriesch, Hannes Pfeifer, Peter Banzer, and Ulf Peschel  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 13744-13754 (2014)

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We demonstrate experimentally and numerically that in fiber tips as they are used in NSOMs azimuthally polarized electrical fields (|Eazi|2 / |Etot|2 ≈55% ± 5% for λ0 = 1550 nm), respectively subwavelength confined (FWHM ≈450 nm ≈λ0/3.5) magnetic fields, are generated for a certain tip aperture diameter (d = 1.4 μm). We attribute the generation of this field distribution in metal-coated fiber tips to symmetry breaking in the bend and subsequent plasmonic mode filtering in the truncated conical taper.

© 2014 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.5430) Physical optics : Polarization
(180.4243) Microscopy : Near-field microscopy
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: January 22, 2014
Revised Manuscript: March 19, 2014
Manuscript Accepted: April 25, 2014
Published: May 30, 2014

Daniel Ploss, Arian Kriesch, Hannes Pfeifer, Peter Banzer, and Ulf Peschel, "Generation and subwavelength focusing of longitudinal magnetic fields in a metallized fiber tip," Opt. Express 22, 13744-13754 (2014)

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